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Registered User
Join Date: Feb 2011
Posts: 38
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Engine problem
I have just put in new spark plugs and changed both fan belts in my 1976 911s, and have the following symptoms:
1. Engine running unstable and not using full potential on high RPM. 2. Engine is overheating (reaching 250 in short time when outside temperature is 20 celcius. 3. Low oil pressure 4. Engine suddenly shuts of when in low RPM (1000) Does anybody recognize this symptoms? Glenn |
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07-31-2012, 03:55 AM
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it sounds like an ignition miss - are you sure the spark plug wires are in the right place? If the wires are old, they may be arc'ing to each other or to ground. Take a look at it idling in the dark to look for the arc's or (not for the timid) run your hands all over the wires as it's idling to feel the shocks.
Did you gap the plugs too far? This can cause mis-fires as well, as the spark finds an easier place to jump. Chuck.H '89 TurboLookTarga, 336k miles |
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07-31-2012, 04:20 AM
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Registered
Join Date: Apr 2010
Location: New Orleans, LA
Posts: 1,493
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if it has cat I would check it for being partially clogged. also change fuel filter as clogged one could cause 1-2 of those symptoms.
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1982 911SC, Mocal oil cooler, Bilsteins, Carrera tensioners, backdated heat, factory short shift, Seine gate shift, turbo tie rods, pop off. 2005 Mercedes-Benz C230 kompressor sport 6-speed (daily driver) |
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07-31-2012, 04:36 AM
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Go Speedracer, go!
Join Date: Aug 2002
Location: Indianapolis
Posts: 1,951
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Are you sure you tightened the fan belt properly? If it's reaching 250 that quick it might not be getting enough cooling air because of a slipping fan belt. A new belt might need to be set at a different number of shims in front off/behind the pulley half. You should have the same total number of shims though as with the old belt.
Ignigion problems could also cause high heat, poor performance. Chuck.H has some good advice above for ignition checks.
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1981 SC ROW Coupe |
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07-31-2012, 05:09 AM
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You have crossed spark plug wires. Re-check your firing order
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1976 Targa 911S 2.7 Yellow 
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07-31-2012, 09:35 AM
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2014 
